Sorry for posting here But,
If I'v finished the Game on Easy Finished All side missions, and all Riddler Related Crap. As I'm unable to start NG+ what if i create a New Save game Finish that on Normal and then Complate NG+ would I still get Perfect Knight - Day 2 over two game saves? thanks.

Sorry for posting here But,
If I'v finished the Game on Easy Finished All side missions, and all Riddler Related Crap. As I'm unable to start NG+ what if i create a New Save game Finish that on Normal and then Complate NG+ would I still get Perfect Knight - Day 2 over two game saves? thanks.

For the mystery stalker achievement do I need to find him right after a specific mission or are you just saying he is found in this order and I can find him after completing the main story?????

The way BROKEN described it is if you're following the story line. But if have already finished it, you can still find him while in Free Roam at those locations. I got the Mystery Stalker trophy after completing the main story mode.
PS: It doesn't have to be in specific order (in Free Roam)

hey,i was just wondering if any of the riddler trophys/riddles or collecables r missable? can u come back and clean them up after u have finished the game or do u have to get them b 4 a certain spot,and r there other then the side missions any other missable trophys? thanks

hey,i was just wondering if any of the riddler trophys/riddles or collecables r missable? can u come back and clean them up after u have finished the game or do u have to get them b 4 a certain spot,and r there other then the side missions any other missable trophys? thanks

Not a single collectible is missable. I collected 95% of the collectibles post game.